Errors have nothing to do with luck; they are caused by time pressure, discomfort or unfamiliarilty with a position, distractions, feelings of intimidation, nervous tension, overambition, excessive caution, and dozens of other psychological factors.
Pal BenkoThere is nothing wrong with trying to exploit the natural human tendency to become impatient when forced to play a boring position.
Pal BenkoSometimes players need to gain time on the clock by repeating the position, but most often its purpose is to wear down the opponent psychologically.
Pal Benko